Double neutral pion photoproduction at threshold

Abstract

We consider the chiral expansion of the threshold amplitude for the reaction $\gamma p\to {\pi }^0{\pi }^{0}p$ to order $\mathcal{O}(M_{\pi }^2)$. We substantiate a claim that this photoproduction channel is significantly enhanced close to threshold due to pion loops. A precise measurement of the corresponding cross sections is called for which allows to test chiral perturbation theory.

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References in corpus (7)

• Chiral Dynamics in Nucleons and Nuclei
• Double Pion Photoproduction on the Nucleon: Study of the Isospin Channels
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Cited by in corpus (18)

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• Study of the gamma p --> pi0 pi0 p reaction with the Crystal Ball/TAPS at the Mainz
• Photoproduction of pi0pi0 and pi0pi+-pairs off the proton from threshold to the second resonance region
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• Model Selection for Pion Photoproduction
• Threshold kaon photo- and electroproduction in SU(3) baryon chiral perturbation theory
• Evaluation of the polarization observables I^S and I^C in the reaction gamma p --> pi^0 eta p
• Effective Field Theory calculations of $NN\to NN\pi$
• Chiral O(Q^4) two-body operators for s-wave pion photoproduction on the NN system
• On the background in the $\gamma p\to \omega ({\pi }^0\gamma )p$ reaction and mixed event simulation
• Theory of two-pion photo- and electroproduction off the nucleon
• Chiral perturbation theory calculation for pn -> dpipi at threshold
• Isospin symmetry breaking in double-pion production in the region of $d^{\ast }(2380)$ and the scalar $\sigma$ meson
• The chiral limit of QCD and above
• New developments in threshold pion photo- and electroproduction